---
title: "An Interesting Charmonium State Formation and Decay: <math>pp→1D2 → 1P1 γ</math> • CBPF Index"
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**Physics Note****Published**

# **An Interesting Charmonium State Formation and Decay: **<math>ppˉ→1D2→1P1 γ</math>\<math>p\\bar{p}\\to^{1}D\_2 \\to ^{1}P\_1 \\ \\gamma\</math><math>ppˉ​→1D2​→1P1​ γ</math>

**M. Anselmino; F. Caruso; F. Murgia; M. M. R. Negrao**

1994

[**Download PDF **0.3 MB](https://index.cbpf.br/files/publicacao/6ad2a767639f62b11adbb5bd/pdf) [**Contact owner**](mailto:apub@cbpf.br?subject=An%20Interesting%20Charmonium%20State%20Formation%20and%20Decay%3A%20%3Cmath%3Epp%E2%86%921D2%20%E2%86%92%201P1%20%CE%B3%3C%2Fmath%3E)

## **Publication details**

<dl>

<dt>Authors</dt>
<dd>M. Anselmino; F. Caruso; F. Murgia; M. M. R. Negrao</dd>

<dt>Type</dt>
<dd>Physics Note</dd>

<dt>Status</dt>
<dd>Published</dd>

<dt>Publication date</dt>
<dd>1994</dd>

<dt>Description</dt>
<dd>Massless perturbative QCD forbids, at leading order, the exclusive annihilation of proton-antiproton into some charmonium states, which, however, have been observed in the &lt;math&gt;p\bar{p}&lt;/math&gt; channel, indicating the significance of higher order and non perturbative effects in the few GeV energy region. The most well known cases are those of the &lt;math&gt;^1S_0 (\eta_c)\,\!&lt;/math&gt; and the &lt;math&gt;^{1}P_1\,\!&lt;/math&gt; . The case of the &lt;math&gt;^{1}D_2\,\!&lt;/math&gt; is considered here and a way of detecting such a state through its typical angular distribution in the radiative decay &lt;math&gt;^{1}D_2 \to ^{1}P_1 \gamma\,\!&lt;/math&gt; is suggested. Estimates of the branching ratio &lt;math&gt;BR(^{1}D_2 \to p\bar{p})&lt;/math&gt;, as given by a quark-diquark model of the nucleon, mass corrections and an instanton induced process are presented.</dd>

<dt>Year</dt>
<dd>1994</dd>

<dt>Number</dt>
<dd>CBPF-NF-014/94</dd>

<dt>Linked to a thesis</dt>
<dd>No</dd>

<dt>Linked to a grant</dt>
<dd>No</dd>

</dl>

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